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bug#20663: page.el (forward-page): Avoid skipping pages

From: Pierre Neidhardt
Subject: bug#20663: page.el (forward-page): Avoid skipping pages
Date: Tue, 26 May 2015 19:14:40 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

When `page-delimiter` starts at the beginning of the line and the position is
also at the beginning of the line, calling `forward-page` will skip one page.

Running `emacs -Q example.txt`:

        C-x n p
        M-1 C-x n p

This should bring us from page 1 to page 2, but page 3 gets displayed instead.

The attached patch fixes it by changing the code to actually match its
surrounding comments.

In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.2)
 of 2015-04-20 on bitzer.hoetzel.info
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description:     Arch Linux

Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2

Important settings:
  value of $LC_MESSAGES: sv_SE.UTF-8
  value of $LANG: sv_SE.UTF-8
  locale-coding-system: utf-8-unix

Pierre Neidhardt

Virginia law forbids bathtubs in the house; tubs must be kept in the yard.

Attachment: ChangeLog
Description: Text document

Attachment: example.txt
Description: Text document

Attachment: page.patch
Description: Text Data

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